Yikes...
The Dallas Cowboys fear star linebacker Sean Lee tore his left ACL during the team's first organized team activity workout Tuesday, a source familiar with the injury told ESPN.
Lee will undergo an MRI on Tuesday to see if the Cowboys' fears are a reality, the source said.
Lee tore his right ACL in April 2008 while at Penn State, then partially tore his left ACL during the 2009 season.
The Cowboys signed Lee to six-year extension last summer worth as much as $51 million. It included a $10 million signing bonus. The base value of the deal is worth $42 million, and Lee could earn up to $9 million more if he plays in at least 80 percent of the snaps.
Lee is vital to the Cowboys' defense. He led the team in tackles in 2011 despite the wrist injury then finished fourth on the team in 2012 with 77 despite playing in only six games. Lee led the Cowboys in interceptions last season with four.